integration: fix NewClientV3 error messages

integration/cluster.go

@@ -739,7 +739,7 @@ func NewClusterV3(t *testing.T, cfg *ClusterConfig) *ClusterV3 {
 	for _, m := range clus.Members {
 		client, err := NewClientV3(m)
 		if err != nil {
-			t.Fatal(err)
+			t.Fatalf("cannot create client: %v", err)
 		}
 		clus.clients = append(clus.clients, client)
 	}

integration/v3_grpc_test.go

@@ -98,7 +98,7 @@ func TestV3PutRestart(t *testing.T) {
 	clus.Members[stopIdx].Restart(t)
 	c, cerr := NewClientV3(clus.Members[stopIdx])
 	if cerr != nil {
-		t.Fatal(cerr)
+		t.Fatalf("cannot create client: %v", cerr)
 	}
 	clus.clients[stopIdx] = c
 
@@ -990,7 +990,7 @@ func TestGRPCRequireLeader(t *testing.T) {
 
 	client, err := NewClientV3(clus.Members[0])
 	if err != nil {
-		t.Fatalf("expected tls client (%v)", err)
+		t.Fatalf("cannot create client: %v", err)
 	}
 	defer client.Close()
 

integration/v3_lock_test.go

@@ -167,7 +167,7 @@ func makeClients(t *testing.T, clients *[]*clientv3.Client, choose func() *membe
 	return func() *clientv3.Client {
 		cli, err := NewClientV3(choose())
 		if err != nil {
-			t.Fatal(err)
+			t.Fatalf("cannot create client: %v", err)
 		}
 		mu.Lock()
 		*clients = append(*clients, cli)